Neb. Rev. Stat. § 14-365.12

If any tax is levied or general obligation bonds are issued by a city of the metropolitan class as authorized under sections 18-501 to 18-511 , the amount of such tax that may be levied by the provisions of section 14-365.01 , or the amount of general obligation bonds that may be issued by the provisions of section 14-365.07 by such city must be reduced by the amount of the tax levied or bonds issued as authorized under sections 18-501 to 18-511 .